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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998969f7973bc1e618038c851b7fd1776504c770b10fa64b6665fb7e40b3ef18' 
  AND token = 'HHfeNH6dio6MrG2hW4KPz8xbv1TKLjv54tDO1o7yE4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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