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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67141f1db74ca8fe706a5f08fd8ffde7d33cb75502a9e517c2a811c76d116f9' 
  AND token = '/9yI0X5dF5iD9VQIx801DCAmhNMsrz+sSHf+21iR+YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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