sd and ed

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'cqt_e_start_date',
		'value'   => 'sd',
		'compare' => 'IN',
	),
	array(
		'key'     => 'cqt_end_date',
		'value'   => 'ed',
		'compare' => 'IN',
	),
);