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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3cb00ca1c0c2ab5b1bd4a53d9af0161b894f03e66faba4fc013d2b7ad3e1bd' 
  AND token = '58PMOKOzo1Xwg9dtR7BJKnrekJLtJhHosI7caNX85Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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