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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff817658afc3616ae2119b2d53aa2672c97d9cb0712599f1cf9c1d0e77a1236' 
  AND token = 'LJp07f6OfBezkddxtMSHVjtlNu44yahiZpsGyuOm/WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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