SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8324f0daa8e4598dabf9b487621c96ddc73266d437d5d7fd4a102dc2cacf2c' 
  AND token = 'DUN1RZ5elz6PcF/zqJwY2GUtKrSynSpFMqCgkZZFW8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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