Sorting is not working in wordpress WP_Query

i have created a page where i am sorting the post according to the views. Here is the query

<?php 
    $temp = $wp_query; 
    $wp_query = null;  
    $wp_query = new WP_Query(); 
    $wp_query->query('showposts=12&order=DESC&orderby=meta_value_num&meta_key=cv_post_views_count&post_type=post'.'&paged='.$paged); 

    while ($wp_query->have_posts()) : $wp_query->the_post(); 
?>

   Post Html and content goes here

 <div class="post-nav-container">
   <?php previous_posts_link( __('&rarr; Older Posts','circoviral')); ?>
   <?php next_posts_link( __('&larr; Older Posts','circoviral')); ?>
 </div>

 <?php 
    $wp_query = null; 
    $wp_query = $temp;  // Reset
 ?>

This is a page template and also i need pagination for this page because this page is having infinite scroll.But when i see the output of the query on the pages , it is not returning me the posts in the manner i requested. Only the sorting is not working.

When i debug the wp_query , i got this

["query"]=>
  array(6) {
    ["showposts"]=>
    string(2) "12"
    ["order"]=>
    string(4) "DESC"
    ["orderby"]=>
    string(14) "meta_value_num"
    ["meta_key"]=>
    string(19) "cv_post_views_count"
    ["post_type"]=>
    string(4) "post"
    ["paged"]=>
    string(1) "0"
  }

Generated SQL Query

SELECT SQL_CALC_FOUND_ROWS cvr_posts.ID
FROM cvr_posts
INNER JOIN cvr_postmeta ON (cvr_posts.ID = cvr_postmeta.post_id)
WHERE 1=1
  AND cvr_posts.post_type = 'post'
  AND (cvr_posts.post_status = 'publish'
       OR cvr_posts.post_status = 'private')
  AND (cvr_postmeta.meta_key = 'cv_post_views_count')
GROUP BY cvr_posts.ID
ORDER BY cvr_postmeta.meta_value DESC LIMIT 0, 12