SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69b22c59dda2f84eba58c8c04a3cc03e84a7c4e524f8e761d20e3522ff41652' 
  AND token = 'P6/jik6/GQ9xLz1LE4GP2HYIZNDRPrVM5oqfqwKQmjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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