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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada0e9a4da28f2ffb06c617c4dbcefd46bc1a42ebc6701049d9e8205b499fdf5' 
  AND token = 'kR3sOCkUdqmbBa84s6kLqjocxipKylFVSWsM5gzAaa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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