SELECT SQL_CALC_FOUND_ROWS nf_posts.ID
FROM nf_posts
LEFT JOIN nf_term_relationships
ON (nf_posts.ID = nf_term_relationships.object_id)
INNER JOIN nf_postmeta
ON ( nf_posts.ID = nf_postmeta.post_id )
WHERE 1=1
AND ( nf_term_relationships.term_taxonomy_id IN (6) )
AND ( ( nf_postmeta.meta_key = 'flat_plan'
AND nf_postmeta.meta_value REGEXP '.*;s:[0-9]+:\"3+1\".*' ) )
AND ((nf_posts.post_type = 'post'
AND (nf_posts.post_status = 'publish'
OR nf_posts.post_status = 'acf-disabled'
OR nf_posts.post_status = 'private')))
GROUP BY nf_posts.ID
ORDER BY nf_posts.post_date DESC
LIMIT 0, 15
3+1 – problem with PLUS
