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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607dd5e6b39274c24425615e49526535198acf63f5152f2d6aae869e272a5f40' 
  AND token = 'WDWkPGjzKz6H5blbHndj+XyPZ4UlDjXdUd5X8ahvQ+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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