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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3cdbf603630e5daa011859eeba5c8fbc4a71d9ada2289518520a5ae6db535d' 
  AND token = 'KBwUTc41dLp4i4SLcEQWwHftdcvx6v5RBUG8hqRsj4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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