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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5d367ac884d2898f5b8158cf4d805ee2a5cf1cfebf94450deeb011f326bf40' 
  AND token = '1WimcDqvS1Rr3c18DKomdMt0zsNMPSaN6RlYgm9BMfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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