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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01aff283c251e4c4d203cf60e9a8e9e5ba841725befbd042ea938edc5cd3771d' 
  AND token = 'zuVI4xp++32n2NK9cQirqoLUp+MjYlMg84TwreK9pLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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