SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2013b457a813c4961dd336da2baff285ce7070d8c3adb4f7765dae9dbf315293' 
  AND token = 'o44gTrGBmTj0Az+NNeTY/Jy9PcvfoAJzJmAHQh+R+Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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