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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873512ea3115d7e41c417e42cfcc2b80b64201c8bba6ae076255c30e5b2c07fb' 
  AND token = '9VqNmNrt2NZUN+1Hbex3lUgZ7ddVDHcSe4j64JiOrGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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