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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f80f901c01897f918ca2e7e9331670349ce8f9f684544551789ce198752548' 
  AND token = 'gBGos6Gcqv6cd+gGFPwO3rQZ9Mlu614R+v0o5gz9Yms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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