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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd552c5857d86e01f807c8ee6265a04849ee1009d094fd745915dcd414781c6ef' 
  AND token = 'D8DlFx4pyenKmt3VOig0nqilkNNhMUM5haIPd1gg3UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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