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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d38ab96dceed68eecc537aa3cc8c4b7bafc37aff06484781a14424015e7c06' 
  AND token = 'KlgbcACwmESItQBfmOGp6aG4Zu4EzqbFc60piXSSKuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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