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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9302b03b53bb742514f070a9d6c994dc83d1aa0d6e5de8500560cb4302dd2c' 
  AND token = 'luvuabyjgXVYYlWcN1FzJcIhkSNqLaXWwHmjcuS4myg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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