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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5d80be4a9b920087f61dea3eec31dd5e6da735e358e46f1bd1a61900b6c915' 
  AND token = 'FNxUibg4zdqF3iM5YkuZIVaPbFzV8ihvmURKzV7wGjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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