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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81da525938210d8fff7f8acd1382bdde4edcc136b6370fed7d2edb1b4137a7d' 
  AND token = 'CBao6QJFxmLFos/Bg7Hr1ogTeeWZNRgoP/+0YVvd7ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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