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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e9383a20d6376e70818d90fd6022f36becea9c3a0cbae90221f1bf24a34ed1' 
  AND token = 'rAaeGdKc7U1jUhozCE0rMGdqieTqw020EHTK1890InQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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