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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83eec28350e9c5756945f64bcd4dacd67978b1e6890b5059ca7d14440317f36' 
  AND token = 'WxaWdwxFqontBQU4w7WM6wjtLzHB2rbtyl12qxWB7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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