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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36a70e81625c1922d805b137e0fb92588dbc8c8fd3df6c6df36024f6727349f' 
  AND token = 'iIAH0go4V5NkITPGNCiEkm6VFfGbtcTESTkBZrQmii0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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