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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a432845b4e77c1be801db63e829b6d2d6868dcab23afb003d5daff4023f4a8ff' 
  AND token = 'YLxY3uQBDiOe5qWqaq08aTfYmIDWFEiNQq24Mynn8C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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