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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30626c37ce376e483766eb754574c463b7d574369739a4b507dbc680f29a2f6b' 
  AND token = 'mUeR5ocjwICFa5uEyr9r9m+xJ+tzz5M4iFCWFPFi2K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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