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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a6f162140f887ac2de0bcc59dcaf690957bb0bfa69778793f4863cadfd46b4' 
  AND token = 'LDkpC7791lmzK2xb4zomPreSxs3M6ZN4ayTv5t1RNl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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