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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1647604fe4daeda260abe981fff21acc6811831aea6d8e64b884e5a0ca2ff0de' 
  AND token = 'q+rKeSes8ewXCt6hRibEM2J5pelwc/7SOlpdy5b+lUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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