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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8ff868c3559a784d6d6742c5a76decc4308714df3acf142c7b7cb55eb2e48f' 
  AND token = 'obwdjvk7J10YAuoI3R8XQfHX/37Wy9OskLqXv+pGHLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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