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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a98c442c2fa713b1a3c9c8c016e8b1ab4b20aaad21d1d0e59e16a45a856a14' 
  AND token = 'vmA0FOTgm/CPsqW87V9VBnhMcNk0+66WkZlFsmqKY/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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