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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a285b579458be5d823c999a3844c64fb55412350175564c7d17eb32a980d5eb3' 
  AND token = 'I6kzS8BkGD2ME6nhkiNeebNjvgsr3oNx+OxShu/ft3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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