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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbd1bee161d6e7fd73487af33460a24a804c5063cdbf8eb4dc7c91cdd03db3e' 
  AND token = 'BNcMn21lMPOk59nLEVgN17uPAyk9Vf2QSkeXjVJj594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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