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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0db14761c7e9e967eee1b276e04a4ce6bc071a072e6791ff82e0a909bd6554' 
  AND token = 'gzVeYF4zF6iGTyygLeSdj2MSKRnX1ngy0IFytgjqHL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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