keesiemeijer on "Need MySQL query to return post_id and meta_value if another meta_value is = 1"

Have you tried it with a meta_query:
http://codex.wordpress.org/Function_Reference/WP_Query#Custom_Field_Parameters

Example [untested]:

$args = array(
	'meta_query' => array(
	 'relation' => 'AND',
		array(
			'key' => 'adults_only',
			'value' => 1,
		),
		array(
			'key' => 'video_url',
			'compare' => 'EXISTS'
		)
	)
);
$posts = get_posts($args);

http://codex.wordpress.org/Template_Tags/get_posts