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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2af84fd1ed22834f8bbbd19879dd8818c12cd83c72a9dcdcbf9a00a772c9ed' 
  AND token = 'bp4MpVEX9cp7iW1juIs2ugKFplk1N7PvZj2mFSSR+yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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