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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcce8c5e564b174e9407f31d3fc1bec780e85e23ad920ac5b0c9189433670e1' 
  AND token = 'Xk1QbsxPSfB1t97en8qIZYpc7ua3gtRMBj0C+ML/f50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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