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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c36e1a27c0105791999ea013cd31581bbf6ccf026a1784a1e3dc9af641cd8d9' 
  AND token = '1aqnR9SWgjtD5BwqYob9ErWIs4XQtYyFBAkYXKU47zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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