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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54693e7a3c1c01567e3aa37e76fb6c9729a4a2f5d9d200ce884571cbbcd6cdb2' 
  AND token = 'P589R4dewJyPVgEaokP07WZ/7AC7pNb48H86Wc2579U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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