How to make this query faster? UNION + Inner Join

[Robin Bartholdson]

SELECT titlar.id AS id, titlar.titel AS titel, titlar.skaparnamn AS skaparnamn, titlar.datumtid AS datumtid, titlar.private AS private
FROM titlar
UNION ALL SELECT trad.titelid AS id, titlar.titel AS titel, trad.skaparnamn AS skaparnamn, trad.datumtid AS datumtid, trad.private AS private
FROM trad
INNER JOIN titlar ON titlar.id = trad.titelid
ORDER BY `datumtid` DESC
LIMIT 1


Thanks very much in advance!
Robin