Two mysql select queries into one query
If the article_id is the same in both tables, and you are looking for the same article in both tables, then you could use an INNER JOIN to join the two tables, using the article_id column.

SELECT ar.given_rating as rating, sa.saved_by as saved 
FROM article_rating  ar
INNER JOIN saved_article sa
ON ar.article_id = sa.article_id
WHERE ar.given_by=? AND sa.saved_by=? AND ar.article_id=?;


DB-Fiddle