SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f244704ebf8f6106076018218390486fdfc9f24ff3c08fd2cc93bb7775a971' 
  AND token = 'TIL3BIbuIDDgKlYR1/ZqDgqGacMYWV95WA4bwqhwb4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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