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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb9cd9319f306d8ff9bb0991e1637d7eccdc6bf8a9ab9f4c4dc70efe8576573' 
  AND token = '9hE+5zaS1rslzrXKD4xemi3BacMnb/t0ohzAPSfP28Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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