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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633a393c8415a07b6a948a36fba4e761c3ba0c04b135f645f8fd5bc923ce75ff' 
  AND token = 'h/ScIzMy/8QzKj0TyxaqPTgdbL1RtyjuQHq0voFcc0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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