Multiple meta query ….. query

$meta_query = array();
if (!empty($grad)) {
    $meta_query[] = array(
         'key' => 'ex_lokacija',
         'value' => $grad ,
         'compare' => 'LIKE'
    )
}
// and so on for each of your keys, then
$args = array(
        'post_type' => 'post',
        'relation' => 'AND',
        'meta_query' => $meta_query
)
$searched_posts = new WP_Query( $args );

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