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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ca1cdced1cf0ac810238f4da2346cfb6c8e34d77e13fdf4edba5cd589ba6ee' 
  AND token = '/bQjiYw5XiNHw4nPNWlQftn2DnX54QyLETUc74JmZXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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