Backend system is running really slow

Our website is fine, but our admin system (/admin) is unusable.
Our hosting company say we have strange SQL
SELECT content FROM jss_extrafields_values WHERE exvalID = 1 AND (SELECT 1805 FROM (SELECT(SLEEP(27-(IF(ORD(MID((SELECT lastAction FROM jpbarber_tights.jss_users ORDER BY logIP LIMIT 11,1),3,1))>48,0,27)))))LWZT)

IF(ORD(MID((SELECT lastAction FROM jpbarber_tights.jss_users ORDER BY logIP LIMIT 11,1),3,1))>48
Our other websites backends which don’t use CloudFlare are fine, Iwe have scanned the server but can not find anything like this code?

Is it CloudFlare and how do I stop it?

Cheers
Jonathan

Support have fixed it, needed to turn my Firewall on to stop SQLi