gistfile1.php

<?php

$query = array(
    'post_type'     => 'servicos',
    'post_status'   => 'published',
    'order'         => 'ASC',
    'orderby'       => 'title',
    'meta_query'    => array(
        array(
            'key'     => '_thumbnail_id',
            'value'   => 1,
            'compare' => '>='
        )
    )
);

?>