Читаем:
SELECT * FROM wp_postmeta WHERE meta_key = '_yoast_wpseo_title' AND meta_id = 3911;
Заменяем:
UPDATE wp_postmeta SET `meta_value` = REPLACE ( meta_value, 'text1', 'text2' ) WHERE `meta_key` = '_yoast_wpseo_title' AND `post_id`='65131';
UPDATE wp_postmeta SET meta_value = 'TextText' WHERE meta_value LIKE 'Slovo%'