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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8f9c69bcbccdea5803824cfe3881700877ad8c6d51f013e2db4b6b5ed01329' 
  AND token = 'wNnCt4r9Awn3gkVdCHveCVKe+DUEcFNZGR5723Vk6Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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