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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71a9813c4576ed10a7c37592da6c09512fa36692e50506cc7e610fc862649aa' 
  AND token = 'mFR+0RbCdsfqE69JTy9NprYJ1DkLB4AFzs7ldjd7i8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}