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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dac095d7f8d7b8b2ed79cebf6e8a742c32ed116859fca696076ec3a3f8baf49' 
  AND token = '1uwScFNqRIiQcJSM83Q7U9ep65BIUafjrqf8WkeYdhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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