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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b70086fb3c1608bdadd0ee1f03ae917915a66f298ea09ab98184b18c5c03e2' 
  AND token = '6w9fjZZ2wTWEdV2ekDEajonRdGbTTVu/rDAKG8NpdDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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