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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1919c4dc00cf8efc6aa6b334ffff771240ab2e1db9148d349ea3ed8b4790676f' 
  AND token = 'sii9PLq76dvxZ0cWbd71xYXMWYBwMrQlbb5I1TEM2Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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