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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa868c231f9616153aa48081f4acb20d1698c5f9fe2a3ca72eb8d9a3e76cef66' 
  AND token = 'KpZ6MNRrACycdJkzYbQHwn53hltZZKt4ei8wcN97sbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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