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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae0ff8581c632e3712deabe55530bba3dc7b43df49663a0d1709dba03f5c61d' 
  AND token = '4p/hZx3Og3sww7T1vEZA4f+nNKwbK2JpsEp9Klg95BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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