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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be7fb7e960e22014b97a0a66354aa0b9e6174edc433b441bec0dc51bd753ca4' 
  AND token = 'fA/IuXBeCCz7nmjySrZVRFxXyxXhQBehpwF1Q6cS8OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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