SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8cd4797e38f9f131646b5eb25796ab8f7bed813bb7d8cf2e105cd709213015' 
  AND token = '5WoXpgWfuJjPhyGEvU5Nl4jwwQwoDT/lD93TzfKjJe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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