SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66582a05bdfe6b79cce02e92178341770143fc146340ee2ecb297a4933d96b3f' 
  AND token = '9/tP+36l9hJ+uVWWzvHCcijWjQhu6W5Kw7ttGUg2C4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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